Question

How will you distinguish between ethylamine and aniline chemically?

Answer 1

Ethylamine and aniline can be distinguished from each other by the azo-dye test. A dye is obtained when aniline (an aromatic amine) reacts with HNO2 (NaNO2 + dil.HCl) at 0-5°C, followed by a reaction with the alkaline solution of 2-naphthol.

Answer 2

Ethylamine :

1) Reaction with nitrous acid gives

ethyl alcohol.

2) It doesn't form precipitate with

bromine water.

Aniline :

1) Reaction with nitrous acid gives

diazonium salt.

2) Treatment with bromine water,

decolourisation of bromine takes

place with the formation of white

precipitate.